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So about 170g difference between 5800 and 6800, really does beg the question if it is worth paying for, will the quality of shift be much different?Will the the 5800 chain-sets be upgrade-able to DI2 componentry when the time comes?

This is the age old question differentiating across Shimano's line. I haven't had a chance to try 5800, but we can look at past generations. Generally speaking, as you move up from 105 to Ultegra to Dura Ace, you get lighter weight, better fit/finish and longevity -- i.e. less slop developing over time due to better fit and materials... exception being Dura Ace cassettes.

If the Ultegra 6800 vs 9000 shift quality difference is any indicator, you won't notice any difference.

So about 170g difference between 5800 and 6800, really does beg the question if it is worth paying for, will the quality of shift be much different?Will the the 5800 chain-sets be upgrade-able to DI2 componentry when the time comes?

-Mostimes there will be more differences than only groups. Like difference in wheels, and discs (when its a disc model)-Also you need to calculate with the real prices you will pay, not prices from the brochure. Maybe you can get somewhere a special offer for a price close to the 105 version?

I currently have bikes with Dura Ace 7800, Ultegra 6800, and have had 6600 ultegra, and Tiagra and Sora cranks and components and have mixed among them.

Functionally, they are all so close it is hard to discern any real difference.

But, yes, each step up is slightly lighter and slightly better alloys and heat treatments so they give better longevity. They diabolically make each step just a little better and a little more expensive so we all end up overbuying and the group becomes obsolete long before it ever actually wears out.

Is it "worth it " ? I'm a sucker as much as anyone else. Just enjoy what you decide upon, because I am sure it will be good and provide years of great functionality.

Since it's a Defy Advanced I would definitely err towards the 5800 and invest in a nice pair of wheels (great previous suggestion). Down the line I'd be more inclined to change the frame. I would always opt for the nicer frame over the nicer groupset given a reasonable comparison.

Honestly, you won't notice a couple hundred gram difference in groupset weight. Functionally, they'll feel quite similar. Would be more focused on getting the right chainset and cassette gearing to suit your riding.

But, yes, each step up is slightly lighter and slightly better alloys and heat treatments so they give better longevity. They diabolically make each step just a little better and a little more expensive so we all end up overbuying and the group becomes obsolete long before it ever actually wears out.

Are you sure about that? 6800 is cheaper than 6700. 5800 is the same price as 5700.

Thanks for some really good input, will see what the dealer has on the floor when I go there, but one of the dealers has offered some pretty good discounts on 2015 bikes, but stock not due for a month or two, so may have to wait.

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